The primary cation shown is the reference. Select all of the cations shown that are more stable than it.

AStructure A
BStructure B
CStructure C
DStructure D

Answer: A, B, C

A cation stabilised by resonance (allyl) or by more alkyl substituents (isopropyl, tert-butyl) is more stable than a primary alkyl cation. The methyl cation has no alkyl stabilisation and is less stable than a primary cation.

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